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01/09/2007
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An alternative to costly rubber-metal composite components for damping vibrations in chassis systems uses a novel cross-linked thermoplastic polyurethane (TPU) and a high strength glass-fibre reinforced polyamide (PA66) produced in a single process, writes Roger Bishop.
Anticipated applications include engine mountings, replacements for rubber/metal bushes in steering systems, roll stabilisation and exhaust system supports.
The development is a joint one between BASF and its Elastogran subsidiary with process expertise contributed by Krauss-Maffei Kunststofftechnik. It will be shown to the industry for the first time at K2007, Dusseldorf, next month.
Using Elastollan TPU-X and the high strength PA66 materials Ultramid A3WG7 CR and A3WG10 CR, mouldings are produced in one step by two-component injection moulding. The abbreviation CR denotes formulations that are optimised for high dynamic loading.
The new Elastollan damping material has an interesting combination of properties. Its compression set and vibration characteristics appear to meet automotive industry requirements and, without the addition of plasticisers, it has a low hardness value of 60 shore A. It withstands long-term temperatures up to 120°C with excursions to 150°C.
The material’s resistance to chemicals, improved by cross-linking, allows applications that would never be considered for classic rubbers because of their susceptibility to certain oils and greases. It also resists ozone, has a neutral odour and readily accepts dies.
For composite applications the TPU is plasticised in a twin-screw extruder, treated with a newly developed liquid pre-polymer and injected onto the PA66. The TPU cross-links at a molecular level during injection moulding and in this way achieves in situ its rubbery properties. It also adheres exceptionally well to the PA66.
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Author
Roger Bishop
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Copyright European Automotive Design.
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